532 BRITISH ORIBATID^. 



The Mandibles vary considerably ; in H. rufulus and 

 H. palUdidus they are long and narrow, with closely- 

 set fine teeth (fig. 9) ; in H. lanatiis they are very 

 exceptional, being short and broad, the teeth so deeply 

 cut as to be almost comb-like ; and the fixed arm of the 

 chela having a narrowed neck ; while above it stands 

 a sort of reduplication of the part, which is not known 

 to me in any other species. 



The Pseudo-stigmata are usually dorsal and but 

 slightly projecting. The pseudo-stigmatic organs in 

 the few species known appear divided into two types ; 

 one long, sweeping, doubly curved, and sparsely but 

 regularly and strongly pectinated on one side only 

 (figs. 3, 11) ; the other with short peduncles and more 

 or less fusiform heads, densely but irregularly covered 

 with short hairs or villous processes; the fusiform 

 eflfect of these organs is greatly due to the accumula- 

 tion of white flocculent matter on these short hairs 

 along the distal part of the organ (figs. 14, 15). 



The LamellBB are absent, but the lamellar hairs gene- 

 rally persist. 



The Tectopedia are not developed. 



The Apodemata are not joined to the sternum, and 

 the latter organ is broken and imperfectly developed. 

 The apodemata from the two sides between the second 

 and third pairs of legs occasionally join, as in some 



NotllTUS. 



The Legs are generally of moderate length and 

 diminish more or less regularly from the proximal to 

 the distal ends ; the tarsi are ordinarily the longest 

 joints. The claws are monodactyle in all known 

 species. 



The Abdomen is generally more or less flat or 

 moderately arched, and somewhat shield- shaped or 

 diamond- shaped ; it is always distinctly divided into 

 segments, two to four in known species, by transverse, 

 straight, or curved cuts, or infoldings of the cuticle. 

 These segments have a slight telescopic motion in 

 .5". lanatus which enables it to erect the spines on its 



